that's president obama has line.in the past would the white house says right now there is not enough evidence. >> there is much more to be done to verify conclusively that the red line that the president has talked about has been crossed. >> shepard: still, the pentagon does have options in case the president decides it's time to take action. jennifer griffin with the news live at the pentagon tonight. explain the possible plans for using force, jen. >> well, both the white house and the pentagon, shep, appear to be buying time. >> we are continuing to assess what happened. i think we should wait to get the facts. before we make any judgments on what action, if any, should be taken and what kind of action. >> a no-fly zone would encounter highly sophisticated russian built aircraft system manned by russian troops and bombing chemical weapon sites might create a cloud that could my grate over jordan, israel and lebanon there are approximately 13 chemical weapons facilities with 40 additional mobile chemical weapon sites scattered across syria. even if invited into syria, as the u.s. w